Add New Line Items while copying from contract

Hello All,

I have a requirement while creating a Sales Order.

I am creating a sales order w.r.t contract and added new columns in contract which describes the number of line items have to be added.

Ex.

Contract 51300001

Itm   Material   Qty   Seq.

10      M1         10     2

Here seq. is 2 means while creating sales order material M1 should be repeated as 2 items.

Sales Order  30000303

Itm   Material   Qty

10      M1         10   

20      M1         10   

This should be appear in screen before saving.

we tried one logic but getting issue in pricing.

How to achieve this requirement?

Cheers,

Bharat